The invention pertains to an (electro)luminescent polymer-acceptor system comprising
a polymer with a plurality of chromophores doped with an acceptor for transferring
excitation energy from the polymer to the acceptor wherein at least one wavelength
of the polymer emission is a wavelength at which the acceptor absorbs energy, and
for emitting energy as photons, characterized in that the dwell time of an exciton
that is to be transferred from the polymer to the acceptor is longer than the time
for transferring said exciton from the polymer to the acceptor, by satisfying the equation
kETppkETpd,
wherein kETpp is the rate constant of the energy transfer
at between two chromophores of the polymer, kETpd is
the rate constant of the energy transfer at between the polymer and the
acceptor. If the energy transfer processes in the polymer-acceptor system can be
described by Frster theory the above equation can be rewritten as
##EQU1##
{overscore (R)}pd is the mean distance between the polymer
and the acceptor, R0pd is the Frster radius, and ETpp
and n are the experimental lifetimes of a single chromophore
and of the plurality of chromophores of the polymer, respectively.
